PARIS — A dragnet across Europe widened on Tuesday to include a second fugitive suspected to have taken part in the Paris terrorist attacks, as officials tried to make sense of a torrent of emerging intelligence about the planning and execution of the attacks.

The police in France and Belgium continued their pursuit of one fugitive, Salah Abdeslam, 26, a Frenchman who is believed to have escaped to Brussels, while a French official — who was briefed on the investigation but was not authorized to discuss operational details — said Tuesday evening that the authorities were looking for an accomplice, whose identity remained unclear.

Seven attackers died in the assault on Friday night, but it now appears that at least nine took part in or helped facilitate the attacks.

Some of the attackers, who killed 129 people in a closely coordinated series of assaults that lasted three hours, rented a house in a suburb northeast of Paris last week, telling the landlady that they were businessmen from Belgium, according to the French official.

The person suspected of organizing the attacks — a Belgian militant named Abdelhamid Abaaoud, who is 28 or 27 — is believed to be in Syria with fellow Islamic State militants, French and U.S. intelligence officials have concluded.

Early Tuesday, 10 French fighter jets, taking off from bases in Jordan and the Persian Gulf, dropped 16 bombs on what the French Defense Ministry described as an Islamic State command center and training center in the group’s self-proclaimed capital of Raqqa, Syria. Hours later, Russia carried out an attack on Raqqa, with cruise missiles and long-range bombers, after acknowledging that a terrorist bomb brought down a Russian jetliner over the Sinai Peninsula in Egypt — a hotbed of Islamic State activity — on Oct. 31.

France, through its defense minister, Jean-Yves Le Drian, took the extraordinary step Tuesday of invoking a European Union treaty that obliges members to help any member that is “the victim of armed aggression on its territory.”

President François Hollande took steps to shore up global support for what he has called a war to annihilate the Islamic State, also known as ISIS or ISIL. He met with Secretary of State John Kerry, who expressed sympathy but reiterated the Obama administration’s view that the group will not be destroyed until Syria’s embattled president, Bashar Assad, leaves power.

Hollande will visit Washington and Moscow next week to meet with President Barack Obama and the Russian president, Vladimir Putin. In Britain, Prime Minister David Cameron told Parliament that the Paris attacks had strengthened the case for intervening against the Islamic State in Syria, a move that Parliament rejected in 2013.

On France’s third and final day of national mourning, crowds gathered to light candles and lay flowers at the Place de la République and at makeshift memorials at the sites of the attacks. In the southwestern city of Toulouse, thousands gathered in the central square, waving French flags and singing “La Marseillaise,” France’s national anthem.

“The terrorists want to erase everything: culture, youth, life, and also history and memory,” Hollande said in a speech at a UNESCO conference in Paris.

“You do not fight against terrorism by hiding, by putting your life on hold, by suspending economic, social and cultural life, by banning concerts, theater, sports competitions,” he said. “We will not yield to terrorism by suspending our way of life.”

Many Parisians and visitors followed his advice, flocking to restaurants, cafes and museums in an effort to carry on with normal life. But the country continued to reel from the attacks, the worst violence on French soil in decades. Officials said that the bodies of 117 of the 129 people killed had been positively identified; 221 of the 352 people injured remained in hospitals, 57 of them in intensive care.

The country remained under a state of emergency, as developments in the investigation emerged in a steady trickle.

In the morning, the authorities seized and towed a black Renault Clio with Belgian license plates in the 18th Arrondissement on the northern edge of Paris, next to the suburb of St.-Denis, where three suicide bombers detonated their explosives during a soccer game at the Stade de France. On Tuesday night, authorities released a photo of one of those bombers — who used a Syrian passport to enter Greece last month, evidently posing as a migrant — and asked for the public’s help in identifying him. The passport was probably stolen, and the identity on the passport page — Ahmad al-Mohammad, 25, of Idlib, Syria — may be that of a dead Syrian soldier, the French official said.

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